CN106202704A - A kind of D.C. magnetic biasing impact evaluation method of determining range - Google Patents
A kind of D.C. magnetic biasing impact evaluation method of determining range Download PDFInfo
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- CN106202704A CN106202704A CN201610533851.1A CN201610533851A CN106202704A CN 106202704 A CN106202704 A CN 106202704A CN 201610533851 A CN201610533851 A CN 201610533851A CN 106202704 A CN106202704 A CN 106202704A
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- magnetic biasing
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of D.C. magnetic biasing impact evaluation method of determining range, for determining the transformer station needing to carry out D.C. magnetic biasing impact evaluation, it is characterised in that described method comprises the following steps: to set up soil model and earthing pole model;Carry out surface potential distribution according to the soil model set up and earthing pole model to calculate;According to the surface potential distribution obtained, determine scope of assessment radius R;According to the scope of assessment R determined, determine the transformer station needing to carry out D.C. magnetic biasing impact evaluation.Compared with prior art, the present invention has and effectively determines and need the transformer station carrying out D.C. magnetic biasing impact evaluation, reduce amount of calculation, reduce modeling complexity and avoid the advantages such as omission.
Description
Technical field
The present invention relates to environmental protection and technical field of direct current power transmission, especially relate to a kind of D.C. magnetic biasing impact evaluation scope
Determine method.
Background technology
When DC transmission system is in normal operating condition, system operating mode is bipolar fashion, and DC current is by just
The power transmission line at negative the two poles of the earth constitutes loop.But in the case of system debug, overhauling or break down, D.C. high voltage transmission can use
The method of operation of one pole ground return circuit.When monopolar ground return runs, earth current field flows through scope environment and can cause relatively electric current
Big impact.Due to now, huge DC current flows into the earth through direct current grounding pole, and causes earth potential in a big way
Significant change.This earthy change, the AC system for areal may produce impact.Such as, for transformation
The AC system of device neutral ground, it will occur that two transformer stations being in different DC potential are constituted back through transmission line of electricity
Road, and have DC current to flow to transformer neutral point and Transformer Winding.Make transformator that DC magnetic bias phenomena, transformator occur
D.C. magnetic biasing can cause transformer noise to increase, vibration aggravation etc., it is also possible to the overheated and harmonic distortion of AC network occurs
Increase.This direct current monopolar operation or run through the earth the impact of AC system is possibly even caused primary equipment when serious
Damage or protection malfunction, be in particular cases also possible to the electronic equipment of surrounding is caused a certain degree of interference, long-term
Direct current impact is also possible to cause damage to circumferentially burying underground to execute.
After substantial amounts of DC engineering builds up, increasing AC transformer receives D.C. magnetic biasing impact, and everybody is gradually
Appreciating the serious of D.C. magnetic biasing impact, therefore D.C. magnetic biasing administers enter as an overall process, the work of normalization
Line pipe is managed, and from the design selection of DC engineering, daily monitoring and O&M to earth-current are required for carrying out related work.Therefore,
Determine D.C. magnetic biasing coverage, set up corresponding methods of risk assessment, means, be effective guarantee D.C. magnetic biasing management work
Means.
DL/T 437-2012 " shape high voltage DC earthing pole fire protection technology " defines direct current grounding pole should carry out when addressing
Simulation calculates, and the earth potential that assessment grounding electrode electric current causes raises the impact of the AC transformer on periphery effective grounding, these
Affect relevant with transformator location, electric parameter, system wiring and power network wiring etc., so non-clear stipulaties in specification
Scope of assessment.
Summary of the invention
It is an object of the invention to for the problems referred to above provide a kind of effectively determine need to carry out D.C. magnetic biasing impact evaluation
Transformer station, reduction amount of calculation, minimizing model complexity and avoid the D.C. magnetic biasing impact evaluation method of determining range omitted.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of D.C. magnetic biasing impact evaluation method of determining range, needs to carry out D.C. magnetic biasing impact evaluation for determining
Transformer station, it is characterised in that described method comprises the following steps:
1) soil model and earthing pole model are set up;
2) according to step 1) in set up soil model and earthing pole model carry out surface potential distribution calculate;
3) according to step 2) in obtain surface potential distribution, determine scope of assessment radius R;
4) according to step 3) in the scope of assessment radius R that determines, determine the power transformation needing to carry out D.C. magnetic biasing impact evaluation
Stand.
The method that the distribution of described surface potential calculates includes that numerical method or software model calculate method.
Concretely comprising the following steps of described numerical method:
21) relation of electric current and the surface potential flowed in soil is determined according to Theory of Electromagnetic Field, it may be assumed that
Wherein, E is electric field intensity, and J is electric current density, ρvFor charge density, t is the time, and σ is electrical conductivity;
22) boundary condition that between different electrical conductivity soil, separating surface meets is determined:
Vi=Vj
Wherein, Vi、VjFor the current potential of soil boundary, ρi、ρjFor soil resistivity;
23) determine that reference frame is three Cartesian coordinates, according to step 21) result obtain surface potential meet
Partial differential equation:
Wherein, V is soil current potential, and (x, y are z) that current source is at (x, y, z) current potential of the contribution at place to f;
24) according to step 22) result determine First Boundary Condition and second kind boundary condition:
First Boundary Condition: v |s1=v0
Second kind boundary condition:
Wherein, v0For border soil current potential, s1, s2 are soil boundary;
25) according to step 23) in equation and step 24) boundary condition, integrating step 1) in set up soil model
With earthing pole model, obtain surface potential distribution.
Described step 3) particularly as follows:
31) with the ground connection extremely center of circle, take the minimum radial direction of soil resistivity obtain surface potential distribution second order lead
Number;
32) in step 31) in obtain surface potential distribution second dervative in, selected value ε is as the limit of scope of assessment
Dividing value;
33) determining value ε position point, calculate distance R between this location point and earthing pole, R is scope of assessment half
Footpath.
Described ε is not more than 0.005V/km2。
Described step 4) particularly as follows:
41) judge that the distance between transformer station and earthing pole, whether less than R, is commented if then needing to carry out D.C. magnetic biasing impact
Estimate, if otherwise entering step 42);
42) judge that the distance between transformer station and earthing pole, whether equal to R, affects if being otherwise made without D.C. magnetic biasing
Assessment, if then entering step 43);
43) judge whether the connected transformer station of transformer station meets the transformer station's evaluation condition that is connected, if then needing to carry out directly
Stream magnetic bias impact evaluation, if being otherwise made without D.C. magnetic biasing impact evaluation.
Described connected transformer station evaluation condition is: the distance between all connected transformer stations and earthing pole no more than R and
Distance between at least one connected transformer station and earthing pole is less than R.
Compared with prior art, the method have the advantages that
(1) the D.C. magnetic biasing impact evaluation method of determining range proposed by the present invention, can be drawn grounding electrode electric current
The D.C. magnetic biasing coverage risen has to be assessed in advance.
(2) assess in advance owing to the D.C. magnetic biasing coverage caused has been had, thus when earthing pole addressing, Ke Yixiang
To reducing evaluation work, reduce amount of calculation.
(3) the D.C. magnetic biasing impact evaluation method of determining range proposed by the present invention, can determine needs effectively
Carry out the transformer station of D.C. magnetic biasing impact evaluation, decrease the complexity of modeling, improve computational efficiency.
(4) when scope of assessment radius being calculated by the present invention, it is only necessary to calculate surface potential and surface potential
Second dervative i.e. can determine that, it is not necessary to knows the concrete wiring of electrical network, not only decreases amount of calculation but also reduce the complicated journey of calculating
Degree.
(5) except considering in addition to the transformer station in scope of assessment radius in the present invention, it is also contemplated that at scope of assessment
The transformer station on radius border, it is to avoid occur omitting, calculate more comprehensive.
Accompanying drawing explanation
Fig. 1 is earthing pole Potential distribution schematic diagram peripherally in the embodiment of the present invention;
Fig. 2 is that in the embodiment of the present invention, earthing pole is distributed along soil resistivity smallest radial direction earth potential second dervative
Figure;
Fig. 3 is AC network wiring diagram around earthing pole in the embodiment of the present invention;
Fig. 4 is the method flow diagram of the present invention;
Fig. 5 is the network internal transformer station schematic diagram of the present invention;
Fig. 6 is the network edge transformer station schematic diagram of the present invention.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implement, give detailed embodiment and concrete operating process, but protection scope of the present invention be not limited to
Following embodiment.
As shown in Figure 4, the invention provides a kind of D.C. magnetic biasing impact evaluation method of determining range, the method is by meter
Calculate the circumferentially Potential distribution that causes of grounding electrode electric current, it is possible to the estimating of D.C. magnetic biasing coverage around the earth polar that achieves a butt joint,
Addressing and the D.C. magnetic biasing suppression work of instructing earthing pole are carried out, and the method comprises the following steps:
S1) earthing pole model and soil model are set up, when using numerical computation method to calculate earthing pole inflow DC current,
Earthy distribution around, described earth potential calculates and uses following numerical computation method:
According to Theory of Electromagnetic Field, the electric current flowed in soil meets constant current field equation with surface potential, for:
Wherein, E is electric field intensity, and J is electric current density, ρvFor charge density, t is the time, and σ is electrical conductivity;
Separating surface between different electrical conductivity soil meets boundary condition and is:
Vi=Vj (4)
Wherein, Vi、VjFor the current potential of soil boundary, ρi、ρjFor soil resistivity;
If reference frame is taken as three Cartesian coordinates, then according to the available current potential of formula (1)~formula (3) meet inclined
The differential equation is:
Wherein, V is soil current potential, and (x, y are z) that current source is at (x, y, z) current potential of the contribution at place to f;
This electric current can be regarded as steady current.Although variable-current over time is in flowing, but electric charge is relative
Position and density are identical, therefore can compare with electrostatic field.According to uniqueness theorem, define following first boundary bar
Part and second kind boundary condition are respectively as follows:
v|s1=v0 (7)
Wherein, v0For border soil current potential, s1, s2 are soil boundary.
May determine that the unique solution of this constant-current field accordingly.According to field equation and boundary condition, can calculate according to practical problem
Surface potential is distributed.
Additionally can also use business software model that surface potential is calculated.
S2) with the ground connection extremely center of circle, take the minimum radial direction of soil resistivity (magnetic bias coverage is the widest), obtain ground
The derivative of the second dervative of Potential distribution, i.e. every kilometer of epd;
S3) second dervative of earth potential distribution should be a decreasing function, and (suggestion is less than 0.005V/ to take some value ε
km2, i.e. corresponding bias current change is less than 1A) and as the boundary value of scope of assessment, this point is assessment with the distance of earthing pole
Scope radius R;
S4) need to carry out the transformer station of D.C. magnetic biasing impact evaluation in determining scope of assessment:
A. for being in the transformer station of network internal, as it is shown in figure 5, this station from earthing pole distance less than scope of assessment radius
R, then should carry out D.C. magnetic biasing impact evaluation.
B. for being in the transformer station of network edge, as shown in Figure 6, when coupled transformer station all at it near ground connection
The side of pole, and at least a transformer station is in the scope of assessment that condition a determines, then carrying out D.C. magnetic biasing impact evaluation
Time, it is also desirable to the row that this station is accounted for.
As a example by calculating the earth potential scattergram of gained around certain earthing pole shown in Fig. 1, in Fig. 1, X-axis positive direction is soil
Earth resistivity minimum direction, zero (0,0) is DC current decanting point, determines around this earthing pole straight according to the following step
Stream magnetic bias coverage:
Step 1: use business software CEDGS to set up soil model, calculate earthing pole Potential distribution peripherally;
Step 2: take the minimum radial direction of resistivity (X-axis positive direction), seeks the second dervative that earth potential is distributed, i.e. every public
In the derivative of epd, obtain the curve of Fig. 2;
Step 3: taking ε is 0.005V/km2, as the boundary value of scope of assessment, in Fig. 2 to should put with earthing pole away from
From for 105km, it is scope of assessment radius R;
Step 4: for the transformer station in the range of being less than 105km from earthing pole, be the transformer station of needs assessment;For
Transformer station beyond 105km, if meeting method s4) in condition b, then also serve as the transformer station of needs assessment, such as the C in Fig. 3
Stand.
Table 1 shows the AC Substation D.C. magnetic biasing at the scope of assessment edge obtained in the present embodiment according to said method
Affecting measured result, with scope of assessment, conclusion determines that condition setting is consistent, demonstrate the accuracy of this method.
Table 1 transformer station distance and neutral point direct current measured result (5000A)
Owing to C station is at earthing pole 117km, at this, the derivative of epd is about 0.0034V/km2, and C stands about
You Liangge transformer station is attached thereto (two stations are not the most in the range of 105km), all at close earthing pole side, radial distance about 9km
Left and right, therefore its DC current is contributed take and, it is considered to its 2 main transformers, circuit are double loop, then loop resistance is about
The half that single line is monotropic, the neutral point current at estimation C station is about 0.0034 × 9 × 9 ÷ 0.25 × 2=2.2A, so separate unit master
The neutral point direct current become is about 1.1A, coincide with measured result.If using 105km as assessment border, then C stands not at scope of assessment
In, its actual measurement bias current is little, it is not necessary to carry out relevant braking measure.
And A station due to adjacent 500kV transformer station distance about 88km and 78km, then potential difference want big about 60-77 times,
Taking intermediate value and be about 68.5 times, in loop resistance, circuit D.C. resistance account for main component, overall loop resistance about 3 times, therefore
Bias current is stood compared to C, and neutral point direct current is about 68.5 ÷ 3=22.8 times, adds the bias current tribute to A station of the B station
Offering (6.8km, about 0.4 times), the bias current of A station estimation is about about 23 times of C station, about 25A, also kisses with measured current
Close.If taking 105km as assessment border, though A stands not in scope of assessment, but model is all being assessed in coupled two 500kV stations
In enclosing, it is step s4) middle situation about illustrating b, therefore it is also required to assessment.
Claims (7)
1. a D.C. magnetic biasing impact evaluation method of determining range, for determining the change needing to carry out D.C. magnetic biasing impact evaluation
Power station, it is characterised in that described method comprises the following steps:
1) soil model and earthing pole model are set up;
2) according to step 1) in set up soil model and earthing pole model carry out surface potential distribution calculate;
3) according to step 2) in obtain surface potential distribution, determine scope of assessment radius R;
4) according to step 3) in the scope of assessment radius R that determines, determine the transformer station needing to carry out D.C. magnetic biasing impact evaluation.
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 1, it is characterised in that described earth's surface electricity
The method that position distribution calculates includes that numerical method or software model calculate method.
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 2, it is characterised in that described numerical value meter
Concretely comprising the following steps of algorithm:
21) relation of electric current and the surface potential flowed in soil is determined according to Theory of Electromagnetic Field, it may be assumed that
Wherein, E is electric field intensity, and J is electric current density, ρvFor charge density, t is the time, and σ is electrical conductivity;
22) boundary condition that between different electrical conductivity soil, separating surface meets is determined:
Vi=Vj
Wherein, Vi、VjFor the current potential of soil boundary, ρi、ρjFor soil resistivity;
23) determine that reference frame is three Cartesian coordinates, according to step 21) result obtain surface potential meet inclined
The differential equation:
Wherein, V is soil current potential, and (x, y are z) that current source is at (x, y, z) current potential of the contribution at place to f;
24) according to step 22) result determine First Boundary Condition and second kind boundary condition:
First Boundary Condition: v |s1=v0
Second kind boundary condition:
Wherein, v0For border soil current potential, s1, s2 are soil boundary;
25) according to step 23) in equation and step 24) boundary condition, integrating step 1) in set up soil model and connect
Earth polar model, obtains surface potential distribution.
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 1, it is characterised in that described step 3)
Particularly as follows:
31) with the ground connection extremely center of circle, take the minimum radial direction of soil resistivity and obtain the second dervative of surface potential distribution;
32) in step 31) in obtain surface potential distribution second dervative in, selected value ε is as the boundary value of scope of assessment;
33) determining value ε position point, calculate distance R between this location point and earthing pole, R is scope of assessment radius.
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 4, it is characterised in that described ε is little
In 0.005V/km2。
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 1, it is characterised in that described step 4)
Particularly as follows:
41) judge whether the distance between transformer station and earthing pole is less than R, if then needing to carry out D.C. magnetic biasing impact evaluation,
If otherwise entering step 42);
42) judge that the distance between transformer station and earthing pole, whether equal to R, is commented if being otherwise made without D.C. magnetic biasing impact
Estimate, if then entering step 43);
43) judge whether the connected transformer station of transformer station meets the transformer station's evaluation condition that is connected, if it is inclined then to need to carry out direct current
Magnetic influence is assessed, if being otherwise made without D.C. magnetic biasing impact evaluation.
D.C. magnetic biasing impact evaluation method of determining range the most according to claim 6, it is characterised in that described connected change
Power station evaluation condition is: the distance between all connected transformer stations and earthing pole is no more than R and at least one transformer station that is connected
And the distance between earthing pole is less than R.
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Cited By (5)
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CN108256234A (en) * | 2018-01-19 | 2018-07-06 | 中电普瑞电力工程有限公司 | A kind of method and system for being used to assess transformer DC magnetic bias influence |
CN108388707A (en) * | 2018-02-05 | 2018-08-10 | 三峡大学 | D.C. magnetic biasing computational methods based on field circuit method under a kind of three-dimensional asymmetric structure soil model |
CN112784516A (en) * | 2021-01-22 | 2021-05-11 | 重庆大学 | High-voltage direct-current transmission direct-current magnetic bias horizontal simulation calculation method based on underground-overground unified loop model construction technology |
CN113591028A (en) * | 2021-07-06 | 2021-11-02 | 国网江西省电力有限公司电力科学研究院 | 41-point fast Hankel transformation method suitable for direct-current magnetic bias risk assessment |
CN114879788A (en) * | 2021-09-24 | 2022-08-09 | 宁夏宁电电力设计有限公司 | Method and system for determining distribution of direct-current magnetic bias current of transformer substation |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108256234A (en) * | 2018-01-19 | 2018-07-06 | 中电普瑞电力工程有限公司 | A kind of method and system for being used to assess transformer DC magnetic bias influence |
CN108256234B (en) * | 2018-01-19 | 2023-09-22 | 中电普瑞电力工程有限公司 | Method and system for evaluating DC magnetic bias influence of transformer |
CN108388707A (en) * | 2018-02-05 | 2018-08-10 | 三峡大学 | D.C. magnetic biasing computational methods based on field circuit method under a kind of three-dimensional asymmetric structure soil model |
CN108388707B (en) * | 2018-02-05 | 2021-07-13 | 三峡大学 | Direct-current magnetic bias calculation method based on field-circuit coupling under three-dimensional asymmetric structure soil model |
CN113408167A (en) * | 2018-02-05 | 2021-09-17 | 三峡大学 | Bias current calculation method based on field circuit coupling |
CN113408167B (en) * | 2018-02-05 | 2024-03-29 | 三峡大学 | DC magnetic bias calculation method based on field path coupling |
CN112784516A (en) * | 2021-01-22 | 2021-05-11 | 重庆大学 | High-voltage direct-current transmission direct-current magnetic bias horizontal simulation calculation method based on underground-overground unified loop model construction technology |
CN112784516B (en) * | 2021-01-22 | 2022-09-30 | 重庆大学 | High-voltage direct-current transmission direct-current magnetic bias level calculation method based on unified loop construction |
CN113591028A (en) * | 2021-07-06 | 2021-11-02 | 国网江西省电力有限公司电力科学研究院 | 41-point fast Hankel transformation method suitable for direct-current magnetic bias risk assessment |
CN113591028B (en) * | 2021-07-06 | 2023-09-12 | 国网江西省电力有限公司电力科学研究院 | 41-point fast Hank transformation method suitable for DC magnetic bias risk assessment |
CN114879788A (en) * | 2021-09-24 | 2022-08-09 | 宁夏宁电电力设计有限公司 | Method and system for determining distribution of direct-current magnetic bias current of transformer substation |
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